Apparatus for increasing combustion in furnaces.



m. 707,249. Patented Aug. I9,- |902.

.1. m-comm. APPARATUS FOR INCREASING COMBUSTION IN FURNACES.

(Application filed Feb. 24, 1902.)

(No Model.)

gJlIlIIllllll;

UNITED STATES PATENT OFFICE.

JAMES H. MCCQNNELL, OF EVANSTON, ILLINOIS.

APPARATUS FOR-INCREASING COMBUSTION IN FURNACES.

SPECIFICATION forming part of Letters Patent No. 707,249, dated August 19, 1902. Application filed February 24,1902. Serial No. 95,285. (No model.)

To all whom it may concern.-

Beit known that 1, JAMES H. MoCoNNELL,a citizen of the United States, and a resident of Evan'ston, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Apparatus for Increasing Combustion in Furnaces, of which the following is a full, clear, and exact description.

This invention has for its object to provide,

a simple and inexpensive means whereby a more effective burning of gases Within a furnace may be secured; and the invention consists in the features of improvement hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the claims at the end of this specification.

Prior to my present invention various devices have been employed with a view to effecting the more perfect combustion of gases generated Within the combustion-chambers of furnaces; but so far as I am aware these devices have been more or less complicated or expensive. it

My present invention a-fiords a most simple and effective means for supplying to the combustion-chamber of a furnacethe air necessary to insure the thorough combustion of the gases generated therein and which otherwise would pass away nnconsumed through the smoke-flue. r

Figure 1 is a View in side elevation, showing a furnace having my invention applied thereto, the smoke-pipe of the furnace being shown in vertical section. Fig. 2 is a View in horizontal section through the smoke-pipe below the damper and looking upward. Fig. 3 is a detail back view of the lower part of the smoke-pipe.

A designates a furnace, from the combustion-chamber A of which leads the smoke pipe or flue B. In the smoke-pipe Bis placed a damper O, that is furnished with the usual turning rod and handle 0. Preferably the damper 0 has one of its edges formed with a notch or aperture 0, so that the escape of products of combustion from the furnace may be caused to occur at one side of the smoke-pipe in the most direct line of draft. toward the chimney-flue and at a point as remote as possible from the path of travel of the supply of fresh air that will be delivered to the smokepipe when my invention is applied thereto.

Within the W311 or the smoke-pipe B is pipe D is formed as a bent pipe, the body of this flue or pipe extending more or less in the path of travel of the outgoing products of combustion and being thus exposed to the heat thereof. The lower or inner end of the pipe or flue D ispreferablycontracted somewhat in order that the expansion of the air under the heat to which the pipe D is subjected shall cause a more forcible injection of the fresh air supply toward the combustionchamber.

The pipe or flue D may, if desired, be provided with a valve at its outer end, whereby the amount of fresh air delivered there through can be regulated. I have shown the upper end of the pipe D as furnished with an ordinary register-valve d, the radial plates of which may be caused to cover more or less the radial openings d at the outer end of the pipe D; but it is not essential that the pipe D be furnished with a valve, as I have obtained excellent results without it.

In practice the damperC will be turned so that its notch or aperture 0 will be adjacent the side of the smoke-pipe, farthest from the 'discharge'e'nd of thedelivery pipe or flue D,

thereby causing the products of combustion to pass outwardthrongh the smoke-pipe at one side thereof, while the supply of fresh air is admitted to the smoke-pipe through the air-delivery flue D.

' In the foregoing description it will be seen that as the fresh air enters the pipe or flue D it will be expanded more or less by the heat to which this pipe is subjected,and. as the products of combustion pass upward'and outward along one side of the smoke pipe or flue the fresh air (although somewhat-preheated) being more dense will passdownward' and inward into the combustion-chamber, whereit will materially aid in effecting a more'perfect combustion of the gases, 850. before their escape from the furnace.

The precise shape or arrangement of the air-delivery flue or pipe D may be varied without departing from the spirit of the invention, and manifestly a plurality of these pipes or fines may be used, if desired.

One advantage of the arrangement of the air-delivery pipe or fine as shown is that the danger of the clogging of this flue when soft coal is used is largely avoided, and even if the pipe D should become somewhat foul it can be readily cleaned by passing a brush through it from the outer end.

It is manifest that my invention may be advantageously applied not only to stoves, but as well also to heat, boiler, or other furnaces.

It will be readily seen that even if the damper 0 is not formed with a peripheral notch still when the damper is turned to the position shown by dotted lines in Fig. lit will allow the escape of the products from the furnace along the side of the pipe farthest from the air-delivery flue or pipe, as these heated products of combustion naturally take the most direct course from the furnace. By means of the damper O the draft through the smoke-flue can be modified, so as to insure that the fresh air admitted through the airdelivery pipe D shall pass downwardly into the furnace instead of being carried upward through the smoke-flue of the products of combustion. As the damper is independent of the air-delivery pipe, the damper can be set at any desired position to insure the most effective results.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with the combustionchamber of a furnace and with a smoke pipe or flue leading therefrom, said smoke pipe or fine having an opening in its wall and having a damper located above said opening, of an open-ended unobstructed air-delivery pipe extending inwardly and downwardly from said opening and away from the wall of the smoke-flue," whereby said pipe shall be surrounded by outgoing products of combustion, said pipe terminating adjacent to but outside the combustion-chamber and adjacent that part of the wall of the smoke-flue farthest from the direct path of the outgoing products of combustion.

2. The combination with the combustionchamber of a furnace and with a smoke pipe or fine leading therefrom, said smoke pipe or flue having an opening in its wall and having a damper located above said opening, of an air-delivery pipe extending inwardly and downwardly from said opening whereby said pipe shall be surrounded by outgoing products of combustion, said pipe having its lower end contracted and terminating outside of the combustion-chamber.

JAMES II. MCCONNEL'L.

\Vitnesses:

WILLIAM F. SINGLETON, ADELAIDE M. BICCONNELL. 

